<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    li{
      width: 400px;
      height: 60px;
      margin: 10px;
      background-color: rgb(43, 155, 21);
    }
  </style>
</head>
<body>
  <div id="app">
    <ul>
      <li v-for="item in arr" :key="item">
        {{ item }}
      </li>
    </ul>
    <!-- 循环得到下标 -->
    <ul>
      <li v-for="(item, index) in arr" :key="index">
        {{ item }}
        =>
        {{ index }}
      </li>
    </ul>
    <!-- 循环对象 -->
    <ul>
      <li v-for="(value,key, index) in json">
        {{ value }}
        => 
        {{ key }}
        => 
        {{ index }}
      </li>
    </ul>
  </div>
  <script src="./vue.global.js"></script>
  <script>
    const { createApp } = Vue;
    const app = createApp({
      data(){
        return {
          arr: ['a', 'b', 'c', 'd'],
          json: {
            name: '小明',
            age: 18,
            gender: '男'
          }
        }
      }
    })
    app.mount('#app')
  </script>
</body>
</html>